JPS63258232A - Display device for vehicle - Google Patents

Abstract

PURPOSE:To enable a driver to confirm visually a displayed image at a focus near an exterior by leading light from a projection device to a driver via the first mirror on a ceiling and the second mirror on a dashboard without any use of a lense. CONSTITUTION:A projection device 6 is fitted to a center console 9 located under the side of a driver's seat 1. On the other hand, the first mirror 11 comprising a total reflection type mirror is fitted to a ceiling 10 forward of the seat 1, and the second mirror 12 comprising a half-mirror is fitted to the top of a dashboard 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a display device for a vehicle, and in particular projects a display pattern of a display device onto a projection surface in front of the driver's seat, and a virtual image of the display pattern is projected in front of the windshield. This invention relates to a so-called head-up display device that is visible overlapping the outside scene.

[Problems to be solved by conventional techniques and inventions] No. 6
The figure shows this type of head-assembly display device, which is installed in the dashboard 2 in front of the driver's seat 1 of the vehicle.
A projection device 6 consisting of a light source 3, a display device 4, and a lens 5 is installed, and the display device 4 from the projection device 6 is
The image of the upper display pattern is reflected by the windshield 7 and is visually recognized as a virtual image 8 in front of the windshield 7.

As the display device 4, a fluorescent display tube, an LED, a liquid crystal cell (LCD), etc. are generally used, and in the case of an LCD, the display pattern is projected onto the windshield 7 by light that is illuminated from behind and passes through. . The lens 5 is used to magnify the projected image 8 of the display pattern and to form the image 8 at a predetermined position in front of the windshield 7.

By the way, in a so-called head-up display device for a vehicle, the driver sees the displayed image overlapping the external scenery seen through the windshield 7, so there is no need to move the line of sight while driving, and therefore the display can be read quickly. It is also said to be helpful for safe driving.

However, in the above-mentioned conventional head-up display device, the light is projected directly from the upper surface of the dashboard onto the windshield 7, so the optical path length to the projection surface is short.
The display image 8 is formed at a relatively close position in front of the windshield 7, and as a result, the driver is required to repeatedly focus on the outside scene and focus on the display image 8, resulting in poor visibility. This has the drawback that not only is it not possible to obtain the desired results, but also that the degree of eye fatigue increases. Therefore, it is conceivable to further insert a lens into the optical path in order to form the display image 8 at a distance, but adding a lens leads to an increase in cost, so this is not preferable.

The present invention has been made in view of the above points, and an object of the present invention is to provide a display device for a vehicle that is low cost and has excellent visibility.

[Means for solving problems]

In order to achieve the above object, the present invention projects a display pattern of a display device onto a projection surface in front of the driver's seat, and a virtual image of the display pattern generated by this projection is visually recognized to overlap with the external scene in front of the windshield. In the vehicle display device, a first mirror that reflects the light emitted from the projection device is provided on the ceiling of the vehicle interior, and a second mirror that reflects the reflected light from the first mirror toward the driver's seat side is provided. It is characterized by a configuration in which it is placed on the dashboard in front of the seat so that a virtual image of the display pattern generated in front of the second mirror can be visually recognized.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which a projection device 6 is attached to a center console 9 located below the side of the driver's seat 1, and a light source, a display device, etc. (not shown) are stored. On the other hand, a first mirror 11 made of a total reflection mirror is fixed to the ceiling 10 in front of the driver's seat, and a second mirror 12 made of a half mirror is provided on the upper surface of the dashboard 2.

As shown in the figure, the light from the projection device 6 is reflected by a first mirror 11 on the ceiling and then reaches a second mirror 12, and this reflected light reaches the driver's eye point. Therefore, the image of the display pattern appears as a virtual image 8 in front of the second mirror 12, and the driver can visually recognize the virtual image 8 overlapping the outside scene through the second mirror 12, which is a half mirror.

In this case, from the projection device 6 to the second mirror 12 which is the projection surface
Since the optical path length is the sum of the distance a from the projection device 6 to the first mirror 11 and the distance Mb from the first mirror 11 to the second mirror 12, the position where the virtual image 8 is formed, that is, The distance d from the second mirror 12 to the virtual image 8 in front is a+b
is equal to

Therefore, the center console 9 in the -a vehicle,
Considering the positional relationship between the ceiling lO and the dashboard 2, the position of the virtual image 8 is 1.5~2.0 (
m), which is close to the external view position.

2 and 3 respectively show other embodiments of the present invention. In the device shown in FIG. 2, the projection device 6 is attached to the front lower part of the dashboard 2 (for example, the position where an ashtray etc. is installed). , so that 1% of the light from this illuminates the first mirror 11 of the ceiling IO, and in the device shown in FIG. 3, the projection device 6 is attached to the lower front of the dashboard, similar to the example shown in FIG. 2. In addition, the first mirror 11 provided on the ceiling 10 is composed of two total reflection mirrors 11a and 11b.

Even in such an embodiment, since the optical path length from the projection device 6 to the second reflection mirror 12 can be relatively long, the virtual image 8 of the display pattern can be formed in front of the windshield near the outside scene. .

FIG. 4 and FIG. 5 show the first mirror 11 in the above embodiment.
The figure shows a structure that allows adjustment of the mounting position.

That is, since the position of the driver's line of sight generally differs from person to person, in order to visually recognize the virtual image 8 at an appropriate position, it is necessary to be able to adjust the optical path according to the position (height) of the driver's line of sight. . Therefore, in the embodiment of the present invention, the mounting angle of the first mirror 11 mounted on the ceiling 10 with respect to the horizontal direction can be adjusted.

To explain the structure in detail based on the figure, the first mirror 11 is attached to one mirror 13;
One end thereof is rotatably supported by a base 15 via a support shaft 14. A groove 13a is provided at the other end of the mirror unit 13, and a screw 16 inserted into the groove 13a is screwed into a screw receiving portion 15a of the base 15. The head of the screw 16 is an adjustment knob 16a, and the mirror unit 13 and the screw receiver 1
A coil spring 17 is installed on the outer periphery of the screw 16 between the
is wound, and the coil spring 17 is
3 is always biased toward the adjustment knob 16a. Therefore,
By rotating the adjustment knob 16a, the mirror unit 13 can be rotated around the support shaft 14, and the reflection angle of the light from the projection device 6 can be adjusted. This allows the position of the virtual image 8 with respect to the line of sight to be changed appropriately.

In the above embodiment, the second mirror 12 provided on the upper surface of the dashboard 2 in front of the windshield 7 is
Since its tip faces toward the windshield 7 on the side opposite to the driver's side, safety for the driver is high.

Furthermore, in the same embodiment, a single half mirror is used as the second mirror 12, but in order to further obtain an optical path length, a plurality of mirrors are installed on the dashboard 2, and the second mirror 12 is It may be configured.

〔Effect of the invention〕

The present invention is as described above, and the light from the projection device is transferred from the first mirror on the ceiling to the second mirror on the dashboard without using a lens.
It is designed to guide the driver through the mirror. Therefore, since the optical path length from the projection device to the second mirror (projection surface) can be long, a virtual image of the display pattern can be formed at a distance. This allows the driver to view the displayed image with a focus close to the outside scene, resulting in good visibility and less fatigue. Furthermore, since no lenses are used, costs can be kept low.

[Brief explanation of drawings]

FIG. 1 is a structural explanatory diagram of an embodiment of the present invention, FIGS. 2 and 3 are structural explanatory diagrams of other embodiments, FIG. 4 is an explanatory diagram of the mounting structure of the first mirror in the embodiment, and FIG. The figure is an external view of a portion of the first mirror, and FIG. 6 is an explanatory diagram of a conventional vehicle display device.゛ l...driver's seat, 2...dashboard, 3.
... light source, 4 ... display device, 6 ... projection device,
7... Windshield, 8... Virtual image, 10... Ceiling, 11... First mirror, 12... Second mirror. Patent applicant Yazaki Sogyo Co., Ltd. Figure 4 Figure 5

Claims (1)

[Claims] In a vehicle display device in which a display pattern of a display device is projected onto a projection surface in front of the driver's seat, and a virtual image of the display pattern generated by this projection is visible overlapping with the external view in front of the windshield, A first mirror that reflects the projected light is provided on the ceiling of the vehicle interior, a second mirror that reflects the reflected light from the first mirror toward the driver's seat is placed on the dashboard in front of the driver's seat, and a second mirror is provided on the dashboard in front of the driver's seat. A display device for a vehicle that allows a virtual image of a display pattern generated in front of a second mirror to be visually recognized.